Which of the following is used as an insecticide?

Options

A. `CHCl_(3)`
B. `"CCl"_(3).NO_(2)`
C. `"COCl"_(2)`
D. `CH_(2)Cl_(2)`

Answer

To determine which of the given compounds is used as an insecticide, we will analyze each option provided in the question.

### Step 1: Identify the Compounds
The question lists several chemical compounds. We need to identify each one:
- A) CSCl3
- B) CCl3NO2
- C) COCl2
- D) CH2Cl2

### Step 2: Analyze Each Compound
1. **CSCl3 (Chloroform)**:
- Chloroform is primarily used as a solvent and has applications in medicine as an anesthetic. It is not used as an insecticide.

2. **CCl3NO2 (Chloropicrin)**:
- Chloropicrin is known to be a broad-spectrum pesticide. It is used as an insecticide, fungicide, and herbicide. This compound is indeed used to kill insects.

3. **COCl2 (Phosgene)**:
- Phosgene is a toxic gas used mainly in organic synthesis. It is not used as an insecticide.

4. **CH2Cl2 (Dichloromethane)**:
- Dichloromethane is used in paint removal and pharmaceuticals. It does not have applications as an insecticide.

### Step 3: Conclusion
From the analysis, the compound that is used as an insecticide is **CCl3NO2 (Chloropicrin)**.

### Final Answer:
**B) CCl3NO2 (Chloropicrin)** is used as an insecticide.

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